JPS6037896A - Alarm - Google Patents

Abstract

PURPOSE:To discharge ozone and to prevent water from mixing into a device from the external by setting a porous body consisting of water-repellent materials to an aperture part. CONSTITUTION:An alarm body A is constituted with an alarm outside case 1, a plastic film 3, a metallic electric contact 4, a diaphragm 5 oscillated by an electromagnet 6, and lead wires 7. A porous body 9 consisting of water-repellent materials is set to a cylindrical plastic mold 10 in an aperture part 2 of the body A. A fluororesin, a polyethylene, a polypropylene, or the like is used as water- repellent material. Diameters of pores of the porous body are regulated to 10-0.1mum.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an alarm device that emits a sound to warn of approach in automobiles, transporters, etc.

(Prior art and its problems) An example of an alarm device is one in which a metal piece vibrates and makes a sound when an electromagnet is activated or deactivated. That is, when the alarm is energized, the metal pieces are attracted to the electromagnet by the electromagnet operation. At the same time, the metal piece separates from the electrical contact, the electrical circuit is interrupted, the electromagnet is stopped, and the metal piece separates from the electromagnet.

When the metal piece moves away from the electromagnet, the electric circuit is activated again, repeating the same action, and as a result, the metal piece vibrates. This metal piece directly hits the object, or the metal piece interacts with a membrane made of plastic, rubber, etc. to generate sound.

During the series of operations described above, an electric spark is generated when the metal piece comes into contact with or separates from the electrical contact.

This spark turns oxygen in the air into ozone. Ozone has strong oxidizing power and corrodes electrical contacts, so alarms are often constructed with openings that must be discharged from inside the alarm, or with gaps so that they are not airtight. Due to this structure, water tends to get mixed in when it rains or when the car is washed, causing a problem in that the water can cause electrical leaks in the internal electrical system. Also, if ozone remains, the combination of ozone and water is more corrosive than ozone alone.

(Structure of the Invention) In view of the above, the present inventors conducted an intensive search for an alarm device that is easy to manufacture and has a simple structure that discharges generated ozone and prevents water from entering from outside. It has been found that it is sufficient to provide a structure in which a porous body made of a water-repellent material is provided in the opening, and a porous body made of a water-repellent material is provided to provide ventilation with the outside through the porous body made of a water-repellent material.

FIG. 1 illustrates a schematic diagram of the alarm device of the present invention, in which (A) shows the main body of the alarm device having an opening (2), and (B) shows a cylindrical plastic molded product (10) with a water-repellent porous material ( 9) is the attached part, and (13) is attached to the opening (2). In the figure, (1) is the outer case of the alarm, (3) is the plastic film, (4) is the metal electrical contact, (5) is the diaphragm that is vibrated by the electromagnet (6), and (7) is the lead wire. .

The above-mentioned water-repellent material refers not only to simple materials such as fluororesin, polyethylene, and polypropylene, but also to materials whose surfaces have been treated with water-repellent treatment using silicone resin or fluororesin. Among the above-mentioned water-repellent materials, fluororesins are excellent, and tetrafluoroethylene resin is a representative example.

A non-woven fabric structure is also suitable as the structure of the porous body, but a structure with high breathability and strength is more suitable for the present invention, so it has a fine fiber structure consisting of nodes interconnected by fibers,
A porous structure in which the diameter of the fibers is 0.1 to 5 microns is optimal. Even if the resin is water-repellent, the pore size is important because if the pore size of the porous body is too large, water will pass through it. In order to prevent water from permeating, the pore diameter must be 10μ or less; conversely, if the pore diameter is too small, the pressure loss will be too large and it will be difficult for ozone to be discharged, so the pore diameter should be 0.1 μm or less.
Must be greater than or equal to μ. Further, the porosity may be 30 to 95% so as to sufficiently exhibit air permeability and have porous body strength. The shape of the porous body may be selected depending on the shape of the opening of the alarm, such as a sheet, a tube, or a rod. Among these, it can be said that a part in which a porous body made of a water-repellent material is heat-sealed or physically attached to the end of a cylindrical molded product as shown in FIG. 1(B) is easy to use.

(Effects of the Invention) The present invention has been described above. According to the present invention, it is possible to obtain an alarm device that is easy to manufacture and has a simple structure, which can discharge ozone generated inside and prevent water from entering from the outside.

[Brief explanation of the drawing]

FIG. 1 illustrates a detailed illustrative cross-sectional view of the invention. (A)... Alarm main body, (B)... Part in which a porous body made of water-repellent material is attached to a cylindrical plastic molded product, (1)... Alarm outer case, (2 )...opening, (3)...plastic film, (4)...metal electrical contact, (5)...diaphragm, (
6)... Electromagnet, (7)... Lead wire, (9)...
・Porous body made of water-repellent material, (10)... Cylindrical plastic molded product 1v Agent: Patent attorney Shoji Yoshitake, 4 Figure 1Δ

Claims (1)

[Claims] (1) A porous body made of a water-repellent material is attached to the opening of an alarm device having at least one opening, and the porous body made of a water-repellent material is connected to the outside. An alarm device characterized by having ventilation. (2) Claim No. 1 in which the water-repellent material is a fluororesin (
Alarm device described in section 1). (6) The alarm device according to claim (2), wherein the fluororesin is a tetrafluoroethylene resin. (4) The porous body has a fine fibrous structure consisting of nodes interconnected by fibers, and the diameter of the fibers is 0.1 to 5.
The alarm device according to claim (1), (2) or 3, which is μ. (5) The porous body has a pore diameter of 0.1 to 10μ and a porosity of 30 to 95μ.
The alarm device described in paragraph 2), paragraph (3) or paragraph 4.